The Operating System of Logistics Center Simulation and Optimization
Research
San-yuan Zhou, Qiang Chen,Yu-qing Song
Department of Logistics Engineering, Beijing Wuzi University, Beijing, China
( zsy624206@sohu.com, chenqiang8909@sina.com,songyuqing@139.com)
Abstract–This article uses computer simulation
method to A logistics center operation system in general and
system studied. To a certain extent to overcome the most
current research is concentrated in one or several specific
operations research and the use of mathematical methods to
the dynamic description is not enough, there are some
reference values of the same study field.
Keywords–Arena software, Discrete event systems,
Logistics center, Simulation and optimization
I. INTRODUCTION
Logistics center in logistics activities plays an
important role in the coordinating organizations, the
logistics center operating system is the most concentrated
expression of all kinds of physical resources in the
logistics center [5]. Its business operation is directly related
to the efficiency and economic benefits of the entire
logistics center. The traditional mathematical modeling
methods cannot solve the problem of the complex
changes in the logistics center. Computer simulation
method can be based on the actual situation of the
simulation model, the statistics of the model simulation
output analysis to assess the logistics system.
The most current research of the operating
system is concentrated in one or several specific
operations research, lack of its holistic and systematic
research, most of the studies has also not very good
according to the actual situation of the logistics center, the
actual cause of logistics center and the research are
disconnect. This article research a specific logistics center
carried out a systematic study and analysis, it has some
theoretical and practical significance.
services to customers in the city, occasionally to other
parts of the province's distribution, however the volume
of business is very small, this article is not set this part of
the distribution business shall be considered. Department
of warehousing goods store management and inspection
of goods shipped into operation. Packaged parts products
stored in the storage area, part of the shipment by the
distribution business, the arrival of orders subject to TRIA
(0.1, 0.6, 1.5) hour distribution; Another part by the
manufacturers using their own delivery, the arrival of
orders subject to 10 + EXPO(38.6) minute distribution. In
purchase operations, generally manufacturers of vehicles
direct delivery the goods to logistics center, the arrival of
orders subject to TRIA (1, 2.5, 5.5) hour distribution.
Only a small part need to pick-up, in order to simplify the
model and accuracy, this article is not set to consider such
orders.
B. Simplifying assumptions
The model assumes that in order to reduce the
workload and interference factors, and can more
appropriately fit the real system. Simplified in this article
are as follows:
1. An order contains several different set of
operating instructions set to several different order entities
arrive at the same time.
2. The distance between the set of logistics
centers and distribution destination for the straight line
distance.
3. Assuming that the vehicles average speed of
50 km / h, the delay cost per order is 100 Yuan.
4. Assume that employees can replace each
other.
5. Facilities are generally not assumed that the
operating system fails.
II. EXAMPLES INTRODUCTION AND SIMPLIFYING
ASSUMPTIONS
III. SYSTEM MODELING
A. Examples Introduction
A logistics center’s business departments
include: finance department, business development,
warehousing and distribution department. The department
of warehousing and distribution is the major operating
departments. Distribution department provide distribution
_________________
Foundation item： wyjd200901
A. Arena software introduction
Arena simulation software research based on
the early SIMAN / CINEMA simulation language and by
Rockwell Company. It’s a representative simulation
software to support discrete event. As general-purpose
visual simulation environment software, arena simulation
software is used in many areas of research[15].
B. Build the simulation model
optimal solution of resource allocation and cost curve
changes in figure 2 and figure 3.
Logistics center operating system activity is
triggered by the orders received, so the starting point of
the operating system of the logistics center is order
research. The arrival of orders can be divided into the
arrival of shipped orders and purchase orders arrive, so A
logistics center operating system can be divided into
shipping operations system and purchase operations
system, top-level model in figure 1.
Fig. 2 Optimal allocation of resources program [15]
Fig. 1 Top-level model [1]
According to the actual situation of A logistics
center operating system, this article in accordance with
the hierarchical modeling ideas shipping the operating
system is divided into warehouse order in, distribution
scheduling, vehicle scheduling, loading and out and out
confirmation. Purchase of the operating system model is
divided into warehouse order in, unloading and in and in
confirmation. Specific sub-module build is not explained
in detail because of space limitation.
IV. ANALYSIS OF SIMULATION RESULTS
After the model simulation, set to logistics
center the service level performance indicators of output
in the operating system statistics in table I.
TABLE I Various types of service levels and output data table
Category
Name
statistics
Space utilization
length of site queue
length of out site queue
Person output
Warehouse keeper person output
Distributor person output
Equipment operation
Number of handling
equipment per day
The quality of
The average daily number of orders
customer service
Out orders delayed
Distribution orders delayed
2.31
1.53
0.41
0.53
4.70
28.43
0.18
0.03
It can be seen from the data in the table above,
the station platform vehicles waiting in line too much, low
efficiency of the warehouse keeper and the distributor.
Equipment utilization is relatively low; the business is
still relatively small scale, order delay deadly accuracy.
These notes operating system have some problems.
Below using the OptQuest optimization package
of the Arena simulation software into the operating
system resources to optimize the study[2]. The objective
function is to minimize the total cost of the operating
system. System operators, vehicles and equipment and
other resources for the control variables[4]. Obtained the
Fig. 3 The total cost of the optimal curve
When the simulation optimization runs to 4th,
two own vehicle, controller, distributor, driver and load
worker value respectively2, 1, 4, 2, 6, 5. The total cost
function to obtain the optimal value is 31410.82 Yuan, so
3220.92 Yuan less than the optimized configuration
program before, it can be seen optimize the cost has been
reduced to a great extent.
V. CONCLUSION
The article uses computer simulation of a
holistic and systematic study of the operating system of
the logistics center, using OptQuest optimization package
comes with the arena software simulation to optimize the
current allocation of resources, get the best allocation of
resources. So there are some reference values to the same
field.
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